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Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 3e5793ebbaae..141c618847ac 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2551,19 +2551,8 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
/* Point of no return */
mm->locked_vm -= locked_vm;
mm->map_count -= count;
- /*
- * Do not downgrade mmap_lock if we are next to VM_GROWSDOWN or
- * VM_GROWSUP VMA. Such VMAs can change their size under
- * down_read(mmap_lock) and collide with the VMA we are about to unmap.
- */
- if (downgrade) {
- if (next && (next->vm_flags & VM_GROWSDOWN))
- downgrade = false;
- else if (prev && (prev->vm_flags & VM_GROWSUP))
- downgrade = false;
- else
- mmap_write_downgrade(mm);
- }
+ if (downgrade)
+ mmap_write_downgrade(mm);
/*
* We can free page tables without write-locking mmap_lock because VMAs